FYI: What Happened in Hollywood This Week

This week was full of post-baby bods, insane celebrity Halloween costumes and so much more. Check out our wrap up below!

THE TONIGHT SHOW WITH JAY LENO -- Episode 4556 -- Pictured: Kim Kardashian during an interview on October 30, 2013 -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank)

Kim Kardashian showed off her post-North body. The reality star didn't take long to get back in shape, and on the "Tonight Show," Kardashian wore a see-through white dress to commemorate the weight loss. The 33-year-old gave birth back in June, and ever since then, she's dealt with a backlash from the media over her weight gain. She even said her revealing bikini selfie was really a "big middle finger to the world." You go girl!

A whole lot of celebrities dressed up in costumes. This past week it seemed like every celebrity had an outrageous costume. Kelly Ripa and Michael Strahan dressed up as everyone from Kim Kardashian and Kanye West to Miley Cyrus and Robin Thicke, and the results were amazing. But that's not all: Ellen DeGeneres copied Nicki Minaj's look, Heidi Klum went as an old woman, and Miley Cyrus brought back the '90s with a Lil' Kim costume. All in all, we think Hollywood really outdid itself this year.

Tina Fey has a new TV show. Never one to take a break, the star's new show has been picked up by NBC for 13 episodes. "Tooken" will star Ellie Kemper ("The Office") and center around a woman who escapes from a cult to start her life over in New York City.

Jack Nicholson and Meryl Streep had an affair!? A new biography by Marc Eliot claims the two had a steamy relationship while filming "Ironweed" and often sneaked away to the trailer during filming. The biography also details Nicholson's drug use, claiming he used LSD and had castration fantasies while under the influence.

Jonas Brothers finally admit they've split. The brothers have been at the center of the rumor mill for weeks regarding a reported rift, and this week they came clean. The band told PEOPLE, "It's over for now," promising it was an "unanimous" decision. Joe Jonas was also targeted by the tabloids as suffering from a bad heroin addiction, a rumor he later denied.

Did we miss any big Hollywood stories? Tell us in the comments!
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